All of these GPS apps suck a lot of battery, especially when using Bluetooth and Wi-Fi at the same time. I have seen the battery go down as much as 20% per hour using Navigon and also on the Seeing Eye GPS app. I have the Garmin Glo receiver and will do a test soon to compare battery drain with and without this external receiver. If anyone has another receiver or the Garmin, please test as well. This will be valuable feedback for folks. Many of us have back-up batteries because of this and other apps that necessitate extra power for power users. Mike Michael May, CEO Sendero Group, Davis California Developers of accessible GPS Sendero Phone: 888-757-6810, extension 101 Home Office: 530-757-6900 Email: MikeMay@xxxxxxxxxxxxxxxx Sendero web: http://www.senderogroup.com General GPS web: http://www.AccessibleGPS.com Mike May Personal: http://www.CrashingThrough.com To change your email settings (unsubscribe, digest only, or vacation mode): http://senderogroup.com/social_media/email.htm Additionally, to unsubscribe send an email to gps-talkusers-request@xxxxxxxxxxxxx with "unsubscribe" in the Subject.